| Propylene is an important basic chemical raw materials,but production process of propylene has been unable to meet the demand for propylene, it is important significance for propane becoming propylene. HSC software was used in dehydrogenation of propane process, and analysis the possible reaction at the thermodynamics. A series of Bi OCl1-xBrx composite catalysts were prepared in this paper, and the influence of preparation methods, radio of Cl and Br, support to oxidative dehydrogenation of propane process. At the same time, the photocatalytic performances of Bi OCl1-xBrx for oxidative dehydrogenation of propane was studied.1. Thermodynamic analysis shows propylene was more easier created when temperature was more than 800 K in dehydrogenation of propane process, it is possible reason that decomposition of propylene was reducing with temperature rising. In oxidative dehydrogenation of propane progress, propylene is more active, so it is key step how to create propylene in the industry. Although the deep oxidation of propylene is controlled in oxidative dehydrogenation of propane under CO2, the progress need high temperature.2. Bi OCl0.1Br0.9 prepared by liquid phase precipitation showed the best activity of oxidative dehydrogenation of propane, the conversion of propane is 6.70% and the selectivity of propylene is 90.21% at 450℃. The conversion of propane is 13.41% and the selectivity of propylene is 87.34% when the catalyst is Bi OCl0.1Br0.9/Fe3O4, the possible reason is synergistic effect of Fe3+ to Bi OCl0.1Br0.9, Fe3O4 has magnetic so Bi OCl0.1Br0.9/Fe3O4 catalyst is easy recovery.3. The photocatalytic reaction of oxidative dehydrogenation of propane, at room temperature, Bi OCl1-xBrx catalysts showed good activity under visible light and ultraviolet light, and because Br was doped, the selectivity of propylene under visible light was better than under ultraviolet light. Bi OCl0.8Br0.2 catalyst showed best activity under visible light, the conversion of propane was 19.07% and the selectivity of propylene was 4.32%. The conversion of propane was increasing with temperature rising, but the selectivity of propylene was reducing and he selectivity of acetone was increasing. Under visible light, when catalyst is Bi OCl0.8Br0.2 /Fe3O4, the conversion of propane was 20.14% and the selectivity of propylene was 3.90%. |
